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HOW TO INSTALL A 200 AMP ELECTRICAL SERVICE

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ANOTHER
G & G ELECTRIC AND PLUMBING DISTRIBUTORS, INC.
INFORMATION SHEET
5
COPYRIGHT 1989
HOW TO INSTALL A 200 AMP ELECTRICAL SERVICE
This will describe the most common type
of electrical service installation, the backto-back where the service panel is located
on the insid e wall d irectly behind the
meter base and is serviced by overhead
lines. The connection between the meter
base and the panel is made through a pipe
nipple and is shown below. It may be
necessary, where the house has a tall
foundation, to make the entry at the bottom
of the panel, but this requires no different
wiring procedure. You will need to have
the main service wires long enough to
reach from the bottom of the panel to the
top.
Mount the panel so that the highest
breaker
lever
does
not
exceed
NEC
requirements from the fl o o r a n d the
cen ter o f the m eter b a se fa lls within the
serving utility companies required height
range from finished grade. Refer to our other
“How-To-Do-It” sheets that show these
mounting heights and detail other requirements
for the masthead and service drop (overhead)
or conduit feed (underground).
All equipment parts of your electrical
service must be b onded to the gro unded
(Neutral) buss bar. In addition, each metal
pipe system, such as the water piping
system, must be bonded to the grounded
(Neutral)
buss
bar.
Provide grounding
electrode system per NEC 250.50. This system
consists of these components: metal
underground water pipe; metal frame of
building (if available metal framing exists); a
concrete encased electrode; two 8’ long 5/8”
iron or steel rod-electrodes.
The bonding
connection (copper wire) size shall be a
minimum of #4 AWG from each electrode to
the panel’s neutral bus. The concrete encased
electrode (Ufer) shall be at least 20’ of #4
(minimum) bare copper conductor or at least
20’ of electrically conductive steel reinforcing
bars encased by at least 2” of concrete located
within and near the bottom of the concrete
foundation. The rod electrodes shall be spaced
a minimum of 6’ apart and shall be driven their
full lengths into the ground.
We recommend the use of #4 bare wire
for all the bonding and grounding of 200 amp
service equipment. These bonding and
grounding conductors must be continuous
(no splices) from the p oint o f origin to
the point of termination. They must be
connected at these points in a clear,
accessible, secure manner and with an
approved device. For additional information on
bonding and grounding see Article 250 of the
National Electrical Code.
(Over)
These “How-To-Do-It” sheets have been reviewed in June 2007 by a professional Engineer. If you find a problem, please notify
G & G Electric & Plumbing at 1900 NE 78th Street, Ste. 101, Vancouver, Washington 98665
ANOTHER
G & G ELECTRIC AND PLUMBING DISTRIBUTORS, INC.
INFORMATION SHEET
COPYRIGHT 1989
1. Select an approved location for the meter
base and drill the holes for m eter to
p anel nip ple. Also d rill the holes
through the eave and roof where the
mast will go through (if overhead).
2. Knock out the appropriate hole in the panel
and secure the nipple to the panel with
a locknut on each side and the grounding
bushing.
5
12. Cut the remaining main conductor wire
to reach from the bottom lugs of the
meter base socket into the m ain lugs
at the panel. Push a ll three wires
through the nipple into the panel.
Connect the main conductor wires to
the bottom lugs of the meter socket.
4. Fasten the meter base to the other end of
the nipp le w ith a lo cknut o n ea ch sid e
a nd then the plastic bushing. Screw the
meter base to the wall.
13. If the panel you are installing uses a
main breaker that has not yet been
installed, do it now. Connect th e m a i n
co nd uct o r w i res to t he lug s on the
breaker or to the main lugs of the panel.
Hook the neu tra l w ire to o ne o f the
la r g er lu g s o n the grounded (neutral)
buss bar.
5. Screw the conduit mast tightly into the hub
of the meter base.
14. Install a #4 bonding wire from the
ground bushing to the ground bar.
6. Install u-bolts or conduit straps (per
serving utilities requirements) around
the mast and, if it is possible, through
the stud plate.
15. Connect the bonding strap or screw to
the ground b ar. Different
manufacturers em ploy d ifferent
m etho d s to acco m p lish this
g ro und ing o f the panel.
3. Position the panel and anchor it in place.
7. Push the service wires up the conduit
mast and leave 24" out of the top end.
8. Cut the two main conductor wires and
connect them to the top terminals of the
meter socket.
NOTE: Apply a liberal coating of corrosion
inhibitor to a ll a luminum w ire once the
insula tio n ha s b een removed. Also use on
the
lugs
and
their
threads
as
the
lubrication that it provides allows the
connection to be made up more tightly.
16. Install a #4 ground wire from the
ground buss of the panel to all locations
previously discussed.
17. Install the branch circuit breakers.
18. Check and tighten all connections once
again!!
9. Bare the neutral (white or smallest of
the 3 wires) at the meter base and
connect it under the center lug of the
meter socket (see illustration). If all the
wire are black use white marking tape at
each end to identify the neutral conductor.
10. Place the roof flashing over top end of
mast, prop erly fit upp er ed g e und er
ro o fing m a teria ls, fasten in place and
caulk as necessary.
11. Remove the top from the weather head.
Install the head onto the conduit. Bend
the wires over and reinstall the top.
These “How-To-Do-It” sheets have been reviewed in June 2007 by a professional Engineer. If you find a problem, please notify
G & G Electric & Plumbing at 1900 NE 78th Street, Ste. 101, Vancouver, Washington 98665
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